Question about 1996 Chevrolet Monte Carlo

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1996 M.Carlo 3.4 Ltr V-6 erratic idle in park. tap gas and engine rpm races like too much gasflow/or/air leak at intake?

Trying to determine if there is an Idle/control module that regulates gas / air mix. No.2 cylinder dead due to possible damaged valve. Engine does have noticeable miss at low rpm but at higher rpm , it smooths out.

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  • Chevrolet Master
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Can be anything you stated from a vac leak is easiest and first to check

any trouble codes stored? free obd 2 scan at local autozone or other car part store

but #2 dead cylinder is definitely a problem; you find out via trouble code scan? dunno if you already had done a tune up to write off the spark plugs

only other way to check that valve problem is a compression tester <shrugs>

good luck to you; you're hunting in the right direction, but no one can give you a definitive answer

Posted on Apr 01, 2015

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There are many other possibilities causing these idle issues.Engine idles rough.There are few help links with solutions to troubleshoot such idle issues.
I suggest you refer the link below and follow its troubleshooting details:------Click the link below:-----Bad miss at idle? http://technoanswers.blogspot.com/2012/01/bad-miss-at-idle.html
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http://schematicsdiagram.blogspot.com/2012/01/while-stop-engine-idles-like-cylinder.html

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Here are the common cause of surges, cold stalls, stalls at stops, slow idle speed, erratic idle speed, rough idle and engine hesitation (and other problems), it is in most cases the idle speed control air-bypass valve and or throttle valve and upper intake, these area's get full of gunk and combustion residue over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.

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